private Class doParseClass(GroovyCodeSource codeSource) {
    validate(codeSource);
    Class answer; // Was neither already loaded nor compiling, so compile and add to cache.
    CompilationUnit unit = createCompilationUnit(config, codeSource.getCodeSource());
    if (recompile != null && recompile || recompile == null && config.getRecompileGroovySource()) {
      unit.addFirstPhaseOperation(
          TimestampAdder.INSTANCE, CompilePhase.CLASS_GENERATION.getPhaseNumber());
    }
    SourceUnit su = null;
    File file = codeSource.getFile();
    if (file != null) {
      su = unit.addSource(file);
    } else {
      URL url = codeSource.getURL();
      if (url != null) {
        su = unit.addSource(url);
      } else {
        su = unit.addSource(codeSource.getName(), codeSource.getScriptText());
      }
    }

    ClassCollector collector = createCollector(unit, su);
    unit.setClassgenCallback(collector);
    int goalPhase = Phases.CLASS_GENERATION;
    if (config != null && config.getTargetDirectory() != null) goalPhase = Phases.OUTPUT;
    unit.compile(goalPhase);

    answer = collector.generatedClass;
    String mainClass = su.getAST().getMainClassName();
    for (Object o : collector.getLoadedClasses()) {
      Class clazz = (Class) o;
      String clazzName = clazz.getName();
      definePackage(clazzName);
      setClassCacheEntry(clazz);
      if (clazzName.equals(mainClass)) answer = clazz;
    }
    return answer;
  }
  /**
   * loads a class from a file or a parent classloader.
   *
   * @param name of the class to be loaded
   * @param lookupScriptFiles if false no lookup at files is done at all
   * @param preferClassOverScript if true the file lookup is only done if there is no class
   * @param resolve see {@link java.lang.ClassLoader#loadClass(java.lang.String, boolean)}
   * @return the class found or the class created from a file lookup
   * @throws ClassNotFoundException if the class could not be found
   * @throws CompilationFailedException if the source file could not be compiled
   */
  public Class loadClass(
      final String name, boolean lookupScriptFiles, boolean preferClassOverScript, boolean resolve)
      throws ClassNotFoundException, CompilationFailedException {
    // look into cache
    Class cls = getClassCacheEntry(name);

    // enable recompilation?
    boolean recompile = isRecompilable(cls);
    if (!recompile) return cls;

    // try parent loader
    ClassNotFoundException last = null;
    try {
      Class parentClassLoaderClass = super.loadClass(name, resolve);
      // always return if the parent loader was successful
      if (cls != parentClassLoaderClass) return parentClassLoaderClass;
    } catch (ClassNotFoundException cnfe) {
      last = cnfe;
    } catch (NoClassDefFoundError ncdfe) {
      if (ncdfe.getMessage().indexOf("wrong name") > 0) {
        last = new ClassNotFoundException(name);
      } else {
        throw ncdfe;
      }
    }

    // check security manager
    SecurityManager sm = System.getSecurityManager();
    if (sm != null) {
      String className = name.replace('/', '.');
      int i = className.lastIndexOf('.');
      // no checks on the sun.reflect classes for reflection speed-up
      // in particular ConstructorAccessorImpl, MethodAccessorImpl, FieldAccessorImpl and
      // SerializationConstructorAccessorImpl
      // which are generated at runtime by the JDK
      if (i != -1 && !className.startsWith("sun.reflect.")) {
        sm.checkPackageAccess(className.substring(0, i));
      }
    }

    // prefer class if no recompilation
    if (cls != null && preferClassOverScript) return cls;

    // at this point the loading from a parent loader failed
    // and we want to recompile if needed.
    if (lookupScriptFiles) {
      // try groovy file
      try {
        // check if recompilation already happened.
        final Class classCacheEntry = getClassCacheEntry(name);
        if (classCacheEntry != cls) return classCacheEntry;
        URL source = resourceLoader.loadGroovySource(name);
        // if recompilation fails, we want cls==null
        Class oldClass = cls;
        cls = null;
        cls = recompile(source, name, oldClass);
      } catch (IOException ioe) {
        last = new ClassNotFoundException("IOException while opening groovy source: " + name, ioe);
      } finally {
        if (cls == null) {
          removeClassCacheEntry(name);
        } else {
          setClassCacheEntry(cls);
        }
      }
    }

    if (cls == null) {
      // no class found, there should have been an exception before now
      if (last == null) throw new AssertionError(true);
      throw last;
    }
    return cls;
  }